package com.czc.mvc.interceptor;


import com.czc.constant.CrowdConstant;
import com.czc.entity.Admin;
import com.czc.exception.AccessForbiddenException;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *  创建拦截器类
 */
public class LoginInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception {

        //1.通过request对象获取Session对象
        HttpSession session = request.getSession();

        //2.尝试从session域中获取admin对象
        Admin admin =(Admin) session.getAttribute(CrowdConstant.ATTR_NAME_LOGIN_ADMIN);

        //3.判断admin对象是否为空
        if(admin==null){
            //4.抛出异常
            throw new AccessForbiddenException(CrowdConstant.MESSAGE_ACCESS_FORBIDEN);
        }

        //5.如果admin对象不为null 则返回true放行
        return true;
    }


}
